Remove usage of FOR_EACH_OBSERVER macro in ash/aura

ash/aura/pointer_watcher_adapter.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/aura/pointer_watcher_adapter.h"
 
 #include "ash/shell.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/window.h"
 #include "ui/display/screen.h"
@@ skipping 77 matching lines @@
     const ui::LocatedEvent& event) const {
   aura::Window* window = static_cast<aura::Window*>(event.target());
   return views::Widget::GetTopLevelWidgetForNativeView(window);
 }
 
 void PointerWatcherAdapter::NotifyWatchers(
     const ui::PointerEvent& event,
     const ui::LocatedEvent& original_event) {
   const gfx::Point screen_location(GetLocationInScreen(original_event));
   views::Widget* target_widget = GetTargetWidget(original_event);
-  FOR_EACH_OBSERVER(
-      views::PointerWatcher, drag_watchers_,
-      OnPointerEventObserved(event, screen_location, target_widget));
+  for (auto& observer : drag_watchers_)
+    observer.OnPointerEventObserved(event, screen_location, target_widget);
   if (original_event.type() != ui::ET_TOUCH_MOVED &&
       original_event.type() != ui::ET_MOUSE_DRAGGED) {
-    FOR_EACH_OBSERVER(
-        views::PointerWatcher, move_watchers_,
-        OnPointerEventObserved(event, screen_location, target_widget));
+    for (auto& observer : move_watchers_)
+      observer.OnPointerEventObserved(event, screen_location, target_widget);
   }
   if (event.type() != ui::ET_POINTER_MOVED) {
-    FOR_EACH_OBSERVER(
-        views::PointerWatcher, non_move_watchers_,
-        OnPointerEventObserved(event, screen_location, target_widget));
+    for (auto& observer : non_move_watchers_)
+      observer.OnPointerEventObserved(event, screen_location, target_widget);
   }
 }
 
 }  // namespace ash